# Great Consensus Cleanup Revival **URL:** \ **Category:** Protocol Design\ **Created:** [March 24, 2024, 5:29pm UTC](https://delvingbitcoin.org/t/great-consensus-cleanup-revival/710 "2024-03-24T17:29:42Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![1440000bytes](https://delvingbitcoin.org/user_avatar/delvingbitcoin.org/1440000bytes/32/301_2.png) [@1440000bytes](https://delvingbitcoin.org/u/1440000bytes)\ **Post date:** [March 24, 2024, 11:52pm UTC](https://delvingbitcoin.org/t/great-consensus-cleanup-revival/710/2 "2024-03-24T23:52:07Z")
> [@AntoineP](#): > > It’s bad. The worst block i could come up with takes around 3 minutes to validate with all 16 cores of my modern laptop’s CPU and a hour and a half of a RPi4. For obvious reasons i’ve redacted here the details of such block, as well as the various approaches to create similarly expensive-to-validate blocks. I’ll share them in a semi-private companion post to other protocol developers using the private working group feature of Delving. If you think you should be in this working group and i forgot to add you, let me know. - It is the worst of all the attacks described in this post and I am surprised no state sponsored miners have tried to solo mine such blocks. - Example for one such blocks and approach is already public. > [@AntoineP](#): > > Some confiscation concerns were raised about the proposed mitigations. I believe those concerns are reasonable and could be addressed by only applying the new rules when checking the script for an output created after a certain block height. This makes sense. > [@AntoineP](#): > > At this stage i’m interested in gathering as many suggestions for cleanups as i can, to make sure that if such a soft fork were to be proposed, we would have carefully analyzed all the fixes we’d like to include. I think SIGHASH\_SINGLE bug reported in 2012 should also be fixed with other bugs: [[Bitcoin-development] Warning to rawtx creators: bug in SIGHASH\_SINGLE](https://www.mail-archive.com/bitcoin-development@lists.sourceforge.net/msg01408.html) --- _[View the full topic](https://delvingbitcoin.org/t/great-consensus-cleanup-revival/710)._